How To Tell A Boy Cow From A Girl Cow

There seems to be a lot of confusion and misinformation out there about how
to tell a boy cow from a girl cow (there's no such thing as a "boy cow," by the
way). Here at CowboyWay.com we've known a lot of people who
didn't know how to tell the difference between a bull, steer, cow or heifer, and a fair
percentage of these folks even had close ties to the farming or ranching
industries.

Fortunately, understanding and recognizing the differences between sexes
in cattle isn't difficult. In the text and photos below we describe how to tell the difference
between male and female animals in the biological subfamily Bovinae (commonly
called bovines) which includes the species cattle. In other words, how to
tell a boy cow from a girl cow. (And we repeat: There's no such thing as a "boy cow." Trust
us.)

The Boys: What You Call Them

In cattle, males (boys) are either bulls, steers, or oxen. We can also use
the word "calf" for a boy because in bovines it's a word that is used for both young males and females.

Bull - A bull is an "intact" male, which is a male
that has testicles. Since a bull has testicles (and assuming he is otherwise
healthy) he can sire offspring. A bull's testicles are contained in a
pouch called called the scrotum, which is visible between the hind legs.

Steer - A steer is a male that was born a bull but has had his testicles removed before reaching sexual maturity. A steer
cannot sire offspring. Because the testicles have been removed the pouch that
contained them, the scrotum, is shrunken and (usually) can't be seen when the
animal is in a normal standing position.

Ox - An ox is a male that was born a bull but has had his testicles removed after reaching sexual maturity. An ox cannot sire
offspring. Because the testicles have been removed the pouch that contained
them, the scrotum, is shrunken and (usually) can't be seen when the animal is in
a normal standing position.

Calf - The word "calf" for cattle is similar
to the word "baby" in humans: It is gender-neutral and can be used to
describe a young male or female. It is commonly used to describe cattle less than
a year old.

Note: Since steers are more common than oxen (the plural of ox), and for
the simplicity of the remainder of this article, we will refer to all
castrated bulls as steers.

Bulls and steers both have a penis and a sheath. Since they
both have a penis, bulls and steers both have a sheath, which is the
external pouch that contains the penis. The sheath is located on the
underneath side of a bull or steer's belly. Depending on the individual the
sheath might be large and very noticeable, or (particularly in steers) barely
visible.

Bulls and steers both have an anus. The anus is
the outlet of the rectum. In both bulls and steers the anus is located
underneath the tail. (Females also have an anus underneath
the tail, but they also have the added presence of a vulva.) Depending on
how the animal is holding its tail, you may, or may not, be able to see the
anus.

The Boys: Let's Have A Look

When determining if a male bovine is a bull or a steer, there are two main places
to look: Underneath the belly and underneath the tail.

Underneath The Belly

Below is a look underneath the belly of a bovine. The presence of the
sheath lets us know that this is male. The additional
presence of the testicles, which are contained in an external pouch called the
scrotum, lets us know that
this a bull. Note: In some cases depending on how and when a steer was castrated
there might be a small amount of the scrotum still visible. However, in these instances
it is quite small and
"dried up" looking, probably difficult to see, and does not resemble the
large, healthy, bull scrotum shown here.

Below: A look underneath the belly of a bull.

This is a look underneath the belly of a young calf (remember, the word "calf" is
gender-neutral and is used to describe both young males and females). We know by the
presence of the sheath that it's a male, but since we cannot see between the
hind legs to know whether or not he has testicles, we can't tell
if it's a bull or a steer. Note: On a calf
this size the testicles, if present, would be contained in a comparatively small
scrotum and would be more
difficult to see than on a mature bull.

Below: A young male calf.

Underneath The Tail

Below is a look underneath the tail of a bovine. The presence of the anus
without the additional presence of a vulva lets us know this is a male. However,
we cannot tell from this limited view if it is a bull or a steer: We would
also need to look beneath the hind legs to see if there are testicles present.

Below: A look underneath the tail of a male bovine.

The Girls: What You Call Them

In cattle, girls are either heifers or cows. We can also use the word "calf"
for a girl because in bovines it's a word that is used for both young females and males.

Heifer - A young female. When a heifer matures she
is called a cow.

Cow - A mature female.

Calf - The word "calf" for cattle is similar
to the word "baby" in humans: It is gender-neutral and can be used to
describe a young female or male. It is commonly used to describe cattle less than
a year old.

Note: Like we mentioned above a heifer is a young female while a cow is a
mature female. For the simplicity of the remainder of this article, we will
usually refer to all females as cows.

Heifers and cows have udders and vulvas. Unlike
bulls and steers, heifers and cows have udders (the mammary glands that produce
milk to feed offspring) and vulvas (the external opening to the
vagina and bladder). Udders are visible between a heifer or cow's hind legs.
Vulvas are visible underneath the tail beneath the anus (assuming the tail
isn't blocking the view).

The Girls: Let's Have A Look

When determining if a bovine is a female, there are two main places
to look: Underneath the belly and underneath the tail.

Underneath The Belly

Cows look different underneath the belly when compared to bulls and
steers. Instead of a scrotum (if it's a bull) and/or a sheath (for both bulls
and steers) cows have an udder.

Below is a look underneath the belly of a bovine. The presence of the udder
between the back legs lets us know that this is a cow. This particular udder is plump and
full-looking because it is full of milk. An udder might
look less full than this, or it might even be empty, but it is still an udder.

Below: A look at the udder on a
cow.

Underneath The Tail

Cows look different underneath the tail than bulls and steers. While
cows, bulls, and steers all have an anus, cows have the added presence of a
vulva beneath the anus.

Below: A look underneath the tail of a cow.

Bathroom Basics For Telling Boys From Girls:Where Does The Urine Come
Out?

Urine exits the body of male and female bovines in different places.

Urine exits a bull or steer through the sheath, which is underneath
the belly.

Urine exits a heifer or cow through the vulva, which is underneath the
tail.

So, if you see a bovine urinating, you can tell if it's a boy or girl
according to
where the urine is exiting the body. (If it's a boy, though, this alone won't
tell you if it's a bull or steer. To know that you'll need a closer look to see
if there are testicles present.)

How NOT To Tell A Boy From A Girl #1: Navels Aren't Sheaths

Both both male and female bovines have a navel, which is the place on the
underneath side of their belly
where the umbilical cord was attached before they were born. In both males and
females the navel is often quite small and in many cases, for most practical purposes, is not visible. Sometimes, however, navels in both males and females
are larger and therefore easily seen.

When a male has a large, visible, navel it more-or-less blends in with the
sheath, which means he's a boy that still looks like a boy.

However, when a female (heifer
or cow) has a large, visible, navel some people mistake it for a sheath.

A visible navel in a cow might be small and barely noticeable, or quite large.

Below: A look at a small but visible navel underneath the belly of a
cow.

To help distinguish a navel from a sheath it's handy to know that the
bottom of a sheath ends in an opening that often has extra-long hairs hanging
from
it (depending on the individual there may be a few extra-long hairs or a
lot). A navel, on the other hand, does not have an opening or extra-long hairs,
and in general has a smoother appearance along its bottom.

Below: The back three-fourths or so of a Charolais bull
showing his hairy sheath (as well as his scrotum).

How NOT To Tell A Boy From A Girl #2: Horns Don't Matter

Both male and female bovines can have horns. Some people are under the
mistaken impression that only males can have them, but in cattle as well as
some other species both males and females can have horns.

It's worth mentioning that while both males and females can
have horns that doesn't mean they have to. Some folks incorrectly believe,
for example, that all bulls have horns. This isn't true. A bull (or steer or
cow, for that matter) may, or may not, have horns.

Below: A cow with horns. (Whether or not this is a
cow can't actually be discerned from the photo, but she was ours for several
years, and we can vouch that she was definitely a cow.)

Parting Thoughts

In mature bovines
there can be, and usually is, a noticeable overall
difference in the appearance between males and females. The mature males (and in
particular the bulls) tend to be larger than females of the same breed, and
exhibit a more muscular appearance. Mature females, on the other hand, tend to be
smaller and may have a more visible bone structure due to being less heavily muscled.

The differences in appearance between male and female bovines is
sometimes described as a more "masculine" or "feminine" appearance. In mature
animals these
differences are sometimes obvious even to casual observers. However, in younger
animals these differences typically haven't developed yet and other methods for
telling boys from girls (such as looking underneath the belly and/or the tail)
must be used.

Below: While we can't see all of the animal, we can
guess by the masculine appearance, including the heavily-muscled neck and
shoulders, that this is a bull. (And, yes, it is.) This bull is two years old
and will get even more heavily muscled as he matures.

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